CN115582422A - Rolling method of thin high-alloy steel plate - Google Patents
Rolling method of thin high-alloy steel plate Download PDFInfo
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- CN115582422A CN115582422A CN202211079225.1A CN202211079225A CN115582422A CN 115582422 A CN115582422 A CN 115582422A CN 202211079225 A CN202211079225 A CN 202211079225A CN 115582422 A CN115582422 A CN 115582422A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/04—Flatness
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a rolling method of a thin high-alloy steel plate, and belongs to the technical field of ferrous metallurgy. The rolling method adopts a sectional reheating rolling process, and comprises the following steps: high-pressure water is applied to remove scale in each rolling pass, the blank is rolled to 60-70mm in 8-10 passes, and the final rolling temperature is 750-790 ℃; hanging back the continuous heating furnace end within 60s of the blank, and then putting back and heating for 3-7min; and (3) rolling in two stages: rolling to the thickness of a finished product in 6-9 passes, and descaling by high-pressure water in each rolling pass. The steel plate rolled by the process has the advantages that the rolling pass percent of the steel plate is more than or equal to 98%, the surface quality of the steel plate is good, the grinding amount is less than or equal to 5%, the plate shape of the steel plate is good, and the unevenness is controlled within 6mm/1m.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a rolling method of a thin high-alloy steel plate.
Background
For wide and thick steel plate production plants, the rolling difficulty of high-alloy thin-specification steel plates is the greatest, and the rolling difficulty is mainly shown in the following aspects:
firstly, the alloy content of the steel plate is high, the heating temperature of the blank is low during rolling, and the steel plate is easy to be rolled to be waste due to temperature loss in the rolling process; secondly, the high alloy steel plate has high strength and hardness and poor toughness and plasticity, and the rolling reduction is limited in the steel plate rolling process (firstly, equipment is protected, and secondly, the steel plate is prevented from being cracked due to overlarge rolling reduction), so that the rolling passes are more, and the steel plate is easy to be rolled and wasted due to temperature loss; finally, the high alloy steel plate is easy to generate iron scale, particularly for thin steel plates, if the phenomenon of iron scale pressing-in occurs, the steel plate is easy to be too large in grinding amount and cannot be used, so that a large amount of high-pressure water is required to be sprayed to remove the iron scale on the surface of the steel plate in the steel plate rolling process, and the blank is easy to be too large in temperature drop and cannot be rolled.
The high alloy steel plate has high production cost, and the steel plate can generate large quality loss outside a plan due to rolling waste or surface quality problems, so the invention subverts the traditional rolling process, innovatively adopts a sectional reheating rolling process, and ensures the rolling success rate of the steel plate and the surface plate type of the rolled steel plate on the premise of not increasing the production cost.
Disclosure of Invention
The invention provides a rolling method of a thin high-alloy steel plate. The method can improve the success rate of steel plate rolling, and the steel plate has good plate shape and low grinding amount.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the rolling method of the thin-gauge high-alloy steel plate adopts a sectional reheating rolling process; rolling in the first stage: high-pressure water is applied to remove scale in each rolling pass, the blank is rolled to 60-70mm in 8-10 passes, and the final rolling temperature is 750-790 ℃; lifting the continuous heating furnace end back within 60s of the blank, and then heating for 3-7min; and (3) rolling in two stages: rolling to the thickness of a finished product in 6-9 passes, and descaling by high-pressure water in each rolling pass.
During the one-stage rolling and the two-stage rolling, the blank is delivered to a rolling mill for rolling within 60s after being discharged from the continuous furnace.
The thickness of the blank is 150-170mm.
The blank is heated in a continuous furnace at the temperature of 1220-1250 ℃, and the time of the blank in the furnace is 180-220min.
The thickness of the steel plate is 10-16mm.
The steel plate of the invention contains 6-7% of alloy.
The rolling pass percent of the steel plate is more than or equal to 98 percent; the surface quality of the steel plate is good, and the grinding amount is less than or equal to 5 percent; the steel plate has good plate shape, and the unevenness is less than or equal to 6mm/1m.
The steel plate C of the invention: 0.11 to 0.14 percent; si:0.11 to 0.33 percent; mn:0.32 to 0.40 percent; cr:4.9 to 5.8 percent; mo:0.46-0.52%.
The alloy steel plate of the invention is referenced to ASME SA-387 in standard and to ASME SA20/SA20M in flatness reference.
The rolling method of the thin high-alloy steel plate adopts a sectional reheating rolling process, and high-pressure water is applied to each rolling pass in the primary and secondary rolling processes, so that the oxide scales on the surface of the steel plate can be removed to the maximum extent; the rolling pass is properly increased, so that the phenomenon of surface tension cracking of the steel plate caused by overlarge rolling reduction is avoided; after the first-stage rolling is carried out to a proper thickness, the blank is returned to the furnace and heated again, so that the rolling waste caused by the temperature loss of the blank can be avoided; the thin-specification blank is adopted for heating and rolling, so that the plate shape of a rolled steel plate can be ensured; the heating temperature is reduced, the time of the blank in the furnace is properly prolonged, the heating quality of the blank can be ensured, and the success rate of subsequent rolling is further improved.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the alloy steel plate produced by the method has the thickness of 10-16mm and the alloy content of 6-7 percent; 2. the steel plate rolling success rate is more than or equal to 98 percent; the steel plate has good surface quality, and the grinding amount is less than or equal to 5 percent; the steel plate has good shape, and the unevenness is controlled within 6mm/1m.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The steel plate of this example has a thickness of 16mm and the contents of the alloying elements are shown in Table 1.
The thickness of the blank is 170mm, the heating temperature in a continuous furnace is 1250 ℃, and the furnace time is 180min.
And a sectional reheating rolling process is adopted when the steel plate is rolled.
In the first stage of rolling process, the blank is delivered to a rolling mill for rolling 60s after being discharged from a continuous furnace, high-pressure water is applied to each rolling pass for descaling, the rolling is carried out for 8 passes to 70mm, and the final rolling temperature is 790 ℃.
The blank is hung back to the continuous furnace end for 60s, and then is installed back and heated for 7min.
In the two-stage rolling process, the blank is conveyed to a rolling mill for rolling 60s after being discharged from the continuous furnace, the thickness of the finished product is obtained by 6 times of rolling, and high-pressure water is applied to each rolling time for descaling.
The rolling pass percent of the steel plate is 98 percent; the surface quality of the steel plate is good, and the grinding amount is 5%; the steel plate has good shape and the unevenness is controlled at 6mm/1m.
Example 2
The steel plate of the present example has a thickness of 10mm, and the contents of the main alloying elements are shown in table 1.
The thickness of the blank is 150mm, the heating temperature in a continuous furnace is 1220 ℃, and the furnace time is 220min.
And a sectional reheating rolling process is adopted when the steel plate is rolled.
In the first-stage rolling process, the blank is conveyed to a rolling mill for rolling after being discharged from a continuous furnace for 54s, high-pressure water is applied to each rolling pass for descaling, the rolling is carried out for 10 passes to 60mm, and the final rolling temperature is 750 ℃.
And (4) hoisting the blank 52s back to the continuous furnace head, and then loading and heating for 3min.
In the two-stage rolling process, the blank is conveyed to a rolling mill for rolling after being discharged from the continuous furnace for 52s, the thickness of the finished product is obtained after 9 passes of rolling, and high-pressure water is applied to each pass of rolling for descaling.
The rolling pass percent of the steel plate is 98.6 percent; the surface quality of the steel plate is good, and the grinding amount is 4%; the steel plate has good shape and the unevenness is controlled to be 5mm/1m.
Example 3
The steel plate of the present example has a thickness of 15mm, and the contents of the main alloying elements are shown in table 1.
The thickness of the blank is 160mm, the heating temperature is 1240 ℃ in a continuous furnace, and the furnace time is 210min.
And a sectional reheating rolling process is adopted when the steel plate is rolled.
In the first-stage rolling process, the blank is conveyed to a rolling mill for rolling 53s after being discharged from a continuous furnace, high-pressure water is applied to descaling each rolling pass, the rolling is carried out for 8 passes until the rolling reaches 62mm, and the final rolling temperature is 759 ℃.
The blank 49s is hung back to the continuous furnace end, and is installed back and heated for 6min.
In the two-stage rolling process, the blank is conveyed to a rolling mill for rolling 53s after being discharged from the continuous furnace, the blank is rolled to the thickness of a finished product in 8 passes, and high-pressure water is used for descaling each rolling pass.
The rolling pass percent of the steel plate is 98.9 percent; the surface quality of the steel plate is good, and the grinding amount is 4.3%; the steel plate has good shape and the unevenness is controlled to be 3mm/1m.
Example 4
The steel plate of the present example has a thickness of 13mm, and the contents of the main alloying elements are shown in Table 1.
The thickness of the blank is 155mm, the heating temperature in a continuous furnace is 1239 ℃, and the furnace time is 197min.
And a sectional reheating rolling process is adopted when the steel plate is rolled.
In the first-stage rolling process, the blank is conveyed to a rolling mill for rolling 47s after being discharged from a continuous furnace, high-pressure water is applied to descaling each rolling pass, the rolling is carried out to 69mm in 9 passes, and the final rolling temperature is 785 ℃.
The blank 49s is hung back to the continuous furnace end, and is installed back and heated for 4min.
In the two-stage rolling process, the blank is conveyed to a rolling mill for rolling 43s after being discharged from the continuous furnace, the thickness of the finished product is obtained by 7-pass rolling, and high-pressure water is applied to each rolling pass for descaling.
The rolling pass percent of the steel plate is 98.9 percent; the surface quality of the steel plate is good, and the grinding amount is 4.3%; the steel plate has good shape, and the unevenness is controlled at 3mm/1m.
Example 5
The steel plate of the present example had a thickness of 11mm, and the contents of the main alloying elements are shown in Table 1.
The thickness of the blank is 154mm, the blank is heated in a continuous furnace at the temperature of 1244 ℃ and the furnace time is 209min.
And a sectional reheating rolling process is adopted when the steel plate is rolled.
In the first-stage rolling process, the blank is delivered to a rolling mill for rolling 59s after being discharged from a continuous furnace, high-pressure water is applied to each rolling pass for descaling, the rolling is carried out for 7 passes to 69mm, and the final rolling temperature is 757 ℃.
The blank 46s is hung back to the continuous furnace head, and is installed back and heated for 4min.
In the two-stage rolling process, the blank is conveyed to a rolling mill for rolling for 54s after being discharged from the continuous furnace, the blank is rolled to the thickness of a finished product in 9 passes, and high-pressure water is used for descaling each rolling pass.
The rolling pass percent of the steel plate is 99 percent; the surface quality of the steel plate is good, and the grinding amount is 4.9%; the steel plate has good shape, and the unevenness is controlled at 4mm/1m.
Example 6
The steel plate of the present example has a thickness of 13mm, and the contents of the main alloying elements are shown in Table 1.
The thickness of the blank is 164mm, the blank is heated in a continuous furnace at the temperature of 1243 ℃ for 199min in the furnace.
And a sectional reheating rolling process is adopted when the steel plate is rolled.
In the first-stage rolling process, the blank is conveyed to a rolling mill for rolling 49s after being discharged from a continuous furnace, high-pressure water is used for descaling each rolling pass, the blank is rolled to 62mm in 8 passes, and the final rolling temperature is 759 ℃.
And hoisting the blank 49s back to the continuous furnace head, and then loading and heating for 3min.
In the two-stage rolling process, the blank is conveyed to a rolling mill for rolling after being discharged from the continuous furnace for 47s, the thickness of the finished product is obtained by 6 times of rolling, and high-pressure water is applied to each rolling time for descaling.
The rolling pass percent of the steel plate is 98.3 percent; the surface quality of the steel plate is good, and the grinding amount is 3.9%; the steel plate has good shape, and the unevenness is controlled at 5mm/1m.
Example 7
The steel plate of the present example has a thickness of 14mm, and the contents of the main alloying elements are shown in Table 1.
The thickness of the blank is 164mm, the heating temperature in a continuous furnace is 1239 ℃, and the furnace time is 195min.
And a sectional reheating rolling process is adopted when the steel plate is rolled.
In the first-stage rolling process, the blank is delivered to a rolling mill for rolling 57s after being discharged from a continuous furnace, high-pressure water is used for descaling each rolling pass, the blank is rolled to 66mm in 9 passes, and the final rolling temperature is 781 ℃.
The blank 54s is hung back to the continuous furnace end, and is installed back and heated for 7min.
In the two-stage rolling process, the blank is conveyed to a rolling mill for rolling after being discharged from the continuous furnace for 52s, the thickness of the finished product is obtained after 9 passes of rolling, and high-pressure water is applied to each pass of rolling for descaling.
The rolling pass percent of the steel plate is 98.3 percent; the surface quality of the steel plate is good, and the grinding amount is 3.4%; the steel plate has good shape and the unevenness is controlled to be 5mm/1m.
Example 8
The steel plate of the present example had a thickness of 11mm, and the contents of the main alloying elements are shown in Table 1.
The thickness of the blank is 151mm, the heating temperature in a continuous furnace is 1239 ℃, and the time in the furnace is 195min.
And a sectional reheating rolling process is adopted when the steel plate is rolled.
In the first-stage rolling process, the blank is delivered to a rolling mill for rolling 59s after being discharged from a continuous furnace, high-pressure water is used for descaling each rolling pass, the blank is rolled to 62mm in 9 passes, and the final rolling temperature is 782 ℃.
And hoisting the blank 53s back to the continuous furnace end, and reinstalling and heating for 5min.
In the two-stage rolling process, the blank is conveyed to a rolling mill for rolling 50s after being discharged from the continuous furnace, the thickness of the finished product is obtained by 6 times of rolling, and high-pressure water is applied to each rolling time for descaling.
The rolling pass percent of the steel plate is 98.2 percent; the surface quality of the steel plate is good, and the grinding amount is 5.9%; the steel plate has good shape, and the unevenness is controlled at 6mm/1m.
The alloy steel sheet of the present example had the alloying element contents shown in table 1.
In the examples, the steel sheet compositions are shown in Table 1.
TABLE 1 Steel plate composition (wt/%) of examples 1-8
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (8)
1. The rolling method of the thin high-alloy steel plate is characterized in that the rolling method adopts a sectional reheating rolling process for the steel plate;
rolling in the first stage: high-pressure water is used for descaling in each rolling pass, the blank is rolled to 60-70mm in 8-10 passes, and the final rolling temperature is 750-790 ℃; hanging back the continuous heating furnace end within 60s of the blank, and then putting back and heating for 3-7min;
and (3) rolling in two stages: rolling the steel plate to the thickness of a finished product in 6-9 passes, and descaling the steel plate by high-pressure water in each rolling pass.
2. The method of rolling a thin gauge high alloy steel sheet according to claim 1, wherein the blank is transported to a rolling mill for rolling within 60 seconds after exiting the continuous furnace in the one-stage rolling and the two-stage rolling.
3. The method of rolling a thin gauge high alloy steel sheet according to claim 1, wherein the billet thickness is 150-170mm.
4. The rolling method of a thin gauge high alloy steel plate according to claim 1, wherein the billet is heated in a continuous furnace at a temperature of 1220-1250 ℃ for 180-220min.
5. A method of rolling a thin gauge high alloy steel sheet as claimed in claims 1 to 4 wherein the steel sheet is 10 to 16mm thick.
6. A method of rolling thin gauge high alloy steel sheet according to claims 1 to 4 where the steel sheet alloy content is 6 to 7%.
7. The method for rolling the thin gauge high alloy steel plate according to any one of claims 1 to 4, wherein the steel plate rolling pass rate is more than or equal to 98%; the surface quality of the steel plate is good, and the grinding amount is less than or equal to 5 percent; the steel plate has good plate shape, and the unevenness is less than or equal to 6mm/1m.
8. A method of rolling a thin gauge high alloy steel sheet according to any one of claims 1 to 4, wherein the steel sheet C:0.11 to 0.14 percent; si:0.11 to 0.33 percent; mn:0.32 to 0.40 percent; cr:4.9 to 5.8 percent; mo:0.46-0.52%.
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| CN202211079225.1A CN115582422A (en) | 2022-09-05 | 2022-09-05 | Rolling method of thin high-alloy steel plate |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101804564A (en) * | 2009-02-16 | 2010-08-18 | 方崇实 | High-efficiency short-flow production line of composite material of high-alloy steel and high-alloy steel |
| KR20120074805A (en) * | 2010-12-28 | 2012-07-06 | 주식회사 포스코 | Method for manufacturing hot rolled steel sheet including high carbon contents with excellent surface quality using minimill process |
| JP2016074028A (en) * | 2014-10-09 | 2016-05-12 | Ｊｆｅスチール株式会社 | Equipment and method for producing hot rolled steel sheet |
| CN108004370A (en) * | 2017-11-27 | 2018-05-08 | 湖南华菱涟源钢铁有限公司 | Process for producing 6-18mm automobile structure steel plate by using surface powder control method |
| CN109234495A (en) * | 2018-10-16 | 2019-01-18 | 江阴兴澄特种钢铁有限公司 | A kind of low compression ratio height flaw detection requires the continuous casting manufacturing technique of SM4Gr2MnNi mold steel plate |
| CN109355572A (en) * | 2018-11-30 | 2019-02-19 | 山西太钢不锈钢股份有限公司 | High-chromium ferritic heat-resistant steel and preparation method thereof |
-
2022
- 2022-09-05 CN CN202211079225.1A patent/CN115582422A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101804564A (en) * | 2009-02-16 | 2010-08-18 | 方崇实 | High-efficiency short-flow production line of composite material of high-alloy steel and high-alloy steel |
| KR20120074805A (en) * | 2010-12-28 | 2012-07-06 | 주식회사 포스코 | Method for manufacturing hot rolled steel sheet including high carbon contents with excellent surface quality using minimill process |
| JP2016074028A (en) * | 2014-10-09 | 2016-05-12 | Ｊｆｅスチール株式会社 | Equipment and method for producing hot rolled steel sheet |
| CN108004370A (en) * | 2017-11-27 | 2018-05-08 | 湖南华菱涟源钢铁有限公司 | Process for producing 6-18mm automobile structure steel plate by using surface powder control method |
| CN109234495A (en) * | 2018-10-16 | 2019-01-18 | 江阴兴澄特种钢铁有限公司 | A kind of low compression ratio height flaw detection requires the continuous casting manufacturing technique of SM4Gr2MnNi mold steel plate |
| CN109355572A (en) * | 2018-11-30 | 2019-02-19 | 山西太钢不锈钢股份有限公司 | High-chromium ferritic heat-resistant steel and preparation method thereof |
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